I just compiled an andriod app and its working fine via emulator and also tried using my device 7.0 but after trying to use the app on andriod 4.4 it crashed after clicking on a particular button..I have testes on firebase lab to get errors..test issue is

Fatal exception

Crash of app com.k9.snaphub running instrumentation ComponentInfo{com.google.android.apps.mtaas.crawler/android.support.test.runner.AndroidJUnitRunner}

here is my log file for the crash

https://00e9e64bac3831b53942f1c1b71704a389d8b404e05e461d0b-apidata.googleusercontent.com/download/storage/v1/b/test-lab-9k4vm93jvh4q4-np0135kphimu4/o/web-build_2017-11-10T10:50:20.859Z_ivp0%2Fhlte-19-en_US-portrait%2Flogcat?qk=AD5uMEtl5LoErMWuvGcTVxcw72dDzvipAmEiXMQfVJXWWiJyIAjGthXyfHrQQobJj2v9OzfLN5e3yIj4b3nioHV0LNoZl8XGeXpflYks-1AT0NHjaoYNx8dybwY0f_wnc0BnrFr-7EbJkOs_tGFbnsTzK3cvROCU3vhFDpA14UfF3QJxjHFdDIYGKqqWmTYqij6JJunHY2UxmtTUdiaHJYSLzn2pxRZL8u7w4QWSgAVRvwFmO5K6gsdlw7nJMFGrm-aLW1w4Xe2eiv6sfxu7RtEJlifm2JGtjB_ZVFg6sAAF73QCMcqtodzicE9O9j1c9lpVAxn5yQKnF4XZYWgoEmsp5vwyW5TDYPSBZN55mDpuFvU5eiTMtAYPRpVFJmh1xgr8QfwCtWgbjHXuNNm7oZUaefk7rK4PGuBxKv6arylLtKdriCRqPmGN4WhvZIrV2de7QeTFCyP-eJNFoz7vUYg2eai-x3KK7PuoRwRPMqSN-q7byYt5VoSiG3BELRVrq_CmCDi8HR-C3y7Er1uj8ow8KW0exxP4WP6cl4gCYA1E0i4h361l9CbwDmo30w2dppWF4OYIaKDVPUIA-8W1hYWVqTiD57u0Ixy3tyBdRiDxzq2GDz-spbC-mR6Ie4ZsjC9uvwmR8ng5777yUsbyVVawTBAe8O6TFoUmXtAIu6UVcBlGko3ZtkLc-T2kScifg2cgGCkZO_9QwJMB5_IqSOuAATHelf1K1bariuqhdUWPMI4_GIg17lcee4wC0wA2RjdyHyHdlkvPaKwDK9xsBmB0qq8Am86vGUvm4a901CR9Ct_bRi6KmLKA5zlF90VXe8Otd7Zw5e0BVvdQYTHapFufxPzgWbc5ug